Add endpointslice webhook for node autonomy (#2218)

* Add endpointslice webhook for node autonomy

Co-authored-by: Jessie Wang <[email protected]>

charts/yurt-manager/templates/yurt-manager-auto-generated.yaml

@@ -1438,6 +1438,25 @@ webhooks:
     resources:
     - endpoints
   sideEffects: None
+- admissionReviewVersions:
+  - v1
+  clientConfig:
+    service:
+      name: yurt-manager-webhook-service
+      namespace: {{ .Release.Namespace }}
+      path: /mutate-core-openyurt-io-v1-endpointslice
+  failurePolicy: Ignore
+  name: mutate.core.v1.endpointslice.openyurt.io
+  rules:
+  - apiGroups:
+    - ""
+    apiVersions:
+    - v1
+    operations:
+    - UPDATE
+    resources:
+    - endpointslices
+  sideEffects: None
 - admissionReviewVersions:
   - v1
   - v1beta1

pkg/yurtmanager/webhook/endpointslice/v1/endpointslice_default.go

@@ -0,0 +1,126 @@
+/*
+Copyright 2024 The OpenYurt Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package v1
+
+import (
+	"context"
+	"fmt"
+
+	corev1 "k8s.io/api/core/v1"
+	discovery "k8s.io/api/discovery/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/runtime"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+
+	nodeutil "github.com/openyurtio/openyurt/pkg/yurtmanager/controller/util/node"
+	podutil "github.com/openyurtio/openyurt/pkg/yurtmanager/controller/util/pod"
+)
+
+// Default satisfies the defaulting webhook interface.
+func (webhook *EndpointSliceHandler) Default(ctx context.Context, obj runtime.Object) error {
+	endpoints, ok := obj.(*discovery.EndpointSlice)
+	if !ok {
+		apierrors.NewBadRequest(fmt.Sprintf("expected an EndpointSlice object but got %T", obj))
+	}
+
+	return remapAutonomyEndpoints(ctx, webhook.Client, endpoints)
+}
+
+// isNodeAutonomous checks if the node has autonomy annotations
+// and returns true if it does, false otherwise.
+func isNodeAutonomous(ctx context.Context, c client.Client, nodeName string) (bool, error) {
+	node := &corev1.Node{}
+	err := c.Get(ctx, client.ObjectKey{Name: nodeName}, node)
+	if err != nil {
+		// If node doesn't exist, it doesn't have autonomy
+		if apierrors.IsNotFound(err) {
+			return false, nil
+		}
+		return false, err
+	}
+
+	return nodeutil.IsPodBoundenToNode(node), nil
+}
+
+// isPodCrashLoopBackOff checks if the pod is crashloopbackoff
+// and returns true if it is, false otherwise.
+func isPodCrashLoopBackOff(ctx context.Context, c client.Client, podName, namespace string) (bool, error) {
+	pod := &corev1.Pod{}
+	err := c.Get(ctx, client.ObjectKey{Name: podName, Namespace: namespace}, pod)
+	if err != nil {
+		if apierrors.IsNotFound(err) {
+			return false, nil
+		}
+		return false, err
+	}
+
+	return podutil.IsPodCrashLoopBackOff(pod.Status), nil
+}
+
+// remapAutonomyEndpoints remaps the notReadyAddresses to the readyAddresses
+func remapAutonomyEndpoints(ctx context.Context, client client.Client, slice *discovery.EndpointSlice) error {
+	if slice == nil || len(slice.Endpoints) == 0 {
+		return nil
+	}
+
+	for _, e := range slice.Endpoints {
+		// If the endpoint is ready, skip
+		if e.Conditions.Ready != nil && *e.Conditions.Ready {
+			continue
+		}
+
+		// If the endpoint is terminating, skip
+		if e.Conditions.Terminating != nil && *e.Conditions.Terminating {
+			continue
+		}
+
+		// If the endpoint doesn't have a node name or target ref, skip
+		if e.NodeName == nil || *e.NodeName == "" || e.TargetRef == nil {
+			continue
+		}
+
+		isAutonomous, err := isNodeAutonomous(ctx, client, *e.NodeName)
+		if err != nil {
+			return err
+		}
+
+		// If the node doesn't have autonomy, skip
+		if !isAutonomous {
+			continue
+		}
+
+		isPodCrashLoopBackOff, err := isPodCrashLoopBackOff(ctx, client, e.TargetRef.Name, e.TargetRef.Namespace)
+		if err != nil {
+			return err
+		}
+
+		// If the pod is in crashloopbackoff, skip
+		if isPodCrashLoopBackOff {
+			continue
+		}
+
+		// Set not ready addresses to ready & serving
+		if e.Conditions.Ready != nil {
+			*e.Conditions.Ready = true
+		}
+		if e.Conditions.Serving != nil {
+			*e.Conditions.Serving = true
+		}
+	}
+
+	return nil
+}